I have a Canon MP460. I have tried 3 sets of ink cartridges MP-40 and MP41 and the printer fails to recognise the cartridges. Would you have any idea to what the problem may be? Many thanks, Sean

The problem may be with the connecting strip ( white) between the cartridge bay and the control board. rmove the strip and clean both the connecting edges using isopropyl alcohal and soft cotton cloth. reconnect it
it will not work if somewhere it is broken, so check it also.
It may be due to the contact pins, from where the printer communicates with the cartridge. so check whether the contact pins are clean or clean with isopropyl alcohal using a soft cloth. reconnect the cartridge and off on the printer.
clean the cartridge contact area also with the same.

Sure...wrong kind of cartridges, no doubt...those cartridge detect programs are quirky at best anyway